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AST RESEARCH TECHNICAL BULLETIN TB-0170 4-25-86
REACH! MODEM INTERFERENCE
Some REACH! modem users have experienced interference problems
when dailing numbers with the REACH! modem.
These customers receive broadcasts of AM radio stations through
the REACH! speaker as the modem is dialing a telephone number.
They are located within a few miles of the interfering stations
transmitter tower. This close proximity to the transmitter is
causing the audio circuits of the REACH! modem to be overdriven,
which demodulates the RF signal, which then plays it through
REACH!'s speaker.
To remove the interference, it is necessary to acquire a rapid
interference filter such as is sold by AT&T in their phone
centers. The part number for AT&T's filter is #Z100A.